import numpy as np
import matplotlib.pyplot as plt

x = np.arange(1, 13)  # 改为 1 到 12，共 12 个点
y_max = np.array([32, 33, 34, 33, 31, 30, 39, 36, 23, 21, 25, 31])
plt.plot(x, y_max)
plt.show()
